首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   1684372篇
  免费   136978篇
  国内免费   2830篇
耳鼻咽喉   22697篇
儿科学   55054篇
妇产科学   48170篇
基础医学   237936篇
口腔科学   48927篇
临床医学   149232篇
内科学   332350篇
皮肤病学   34992篇
神经病学   137341篇
特种医学   67449篇
外国民族医学   477篇
外科学   257145篇
综合类   40949篇
现状与发展   4篇
一般理论   609篇
预防医学   129757篇
眼科学   38720篇
药学   126387篇
  3篇
中国医学   3079篇
肿瘤学   92902篇
  2018年   16324篇
  2016年   14128篇
  2015年   16504篇
  2014年   22802篇
  2013年   34982篇
  2012年   47483篇
  2011年   49910篇
  2010年   29288篇
  2009年   28066篇
  2008年   48008篇
  2007年   50819篇
  2006年   51361篇
  2005年   50174篇
  2004年   49394篇
  2003年   47176篇
  2002年   46286篇
  2001年   76366篇
  2000年   78814篇
  1999年   67029篇
  1998年   18762篇
  1997年   17269篇
  1996年   17107篇
  1995年   16797篇
  1994年   15770篇
  1993年   14814篇
  1992年   55924篇
  1991年   54229篇
  1990年   52958篇
  1989年   51241篇
  1988年   47598篇
  1987年   46935篇
  1986年   44676篇
  1985年   43269篇
  1984年   32642篇
  1983年   28205篇
  1982年   16966篇
  1981年   15194篇
  1980年   14270篇
  1979年   30875篇
  1978年   21522篇
  1977年   18253篇
  1976年   17131篇
  1975年   17945篇
  1974年   21798篇
  1973年   20979篇
  1972年   19080篇
  1971年   17937篇
  1970年   16471篇
  1969年   15383篇
  1968年   14059篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
3.
Academic output is just one aspect of a successful career as a plastic surgeon. However, for those with a strong interest in academia, the academic output of a department will likely be a key factor when deciding how to rank jobs. The aim of this study was to quantify and rank the academic output of plastic surgery units across the UK and Ireland. The Institute for Scientific Information (ISI) Web of Science Bibliometric analysis tool was used to collate cumulative (1950–2016), 10 year (2006–2016) and 3 years (2013–2015) research output data for plastic surgery units in the UK and Ireland. Sixty-six plastic surgery units were identified. Departments were ranked for each time period according to the number of papers produced, number of citations (Nc) and h-index (a measure of the impact of scientific output). The top 3 departments for number of papers in the last 10 years were The Royal Free Hospital, London (226) Broomfield Hospital, Chelmsford (218), and Morriston Hospital and Swansea (188). The top 3 for h-number were The Royal Free Hospital (21) Wythenshawe Hospital, Manchester (18) and Morriston Hospital (17). Academic output varies across plastic surgery units in the UK and Ireland. A number of departments have consistently maintained high academic outputs across the years and will be of interest to surgeons hoping to pursue a career in academia.  相似文献   
4.

Objectives

Expedient extubation after cardiac surgery has been associated with improved outcomes, leading to postoperative extubation frequently during overnight hours. However, recent evidence in a mixed medical-surgical intensive care unit population demonstrated worse outcomes with overnight extubation. This study investigated the impact of overnight extubation in a statewide, multicenter Society of Thoracic Surgeons database.

Methods

Records from 39,812 patients undergoing coronary artery bypass grafting or valve operations (2008-2016) and extubated within 24 hours were stratified according to extubation time between 06:00 and 18:00 (day) or between 18:00 and 6:00 (overnight). Outcomes including reintubation, mortality, and composite morbidity-mortality were evaluated using hierarchical regression models adjusted for Society of Thoracic Surgeons predictive risk scores. To further analyze extubation during the night, a subanalysis stratified patients into 3 groups: 06:00 to 18:00, 18:00 to 24:00, and 24:00 to 06:00.

Results

A total of 20,758 patients were extubated overnight (52.1%) and were slightly older (median age 66 vs 65 years, P < .001) with a longer duration of ventilation (4 vs 7 hours, P < .001). Day and overnight extubation were associated with equivalent operative mortality (1.7% vs 1.7%, P = .880), reintubation (3.7% vs 3.4%, P = .141), and composite morbidity-mortality (8.2% vs 8.0%, P = .314). After risk adjustment, overnight extubation was not associated with any difference in reintubation, mortality, or composite morbidity-mortality. On subanalysis, those extubated between 24:00 and 06:00 exhibited increased composite morbidity-mortality (odds ratio, 1.18; P = .001) but no difference in reintubation or mortality.

Conclusions

Extubation overnight was not associated with increased mortality or reintubation. These results suggest that in the appropriate clinical setting, it is safe to routinely extubate cardiac surgery patients overnight.  相似文献   
5.
6.
7.
8.
9.
10.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号